Function TEST

cpp/src/arrow/util/tracing_test.cc:40–47

This test is a regression for ARROW-15604. OT has some static state that can be initialized after the CPU and I/O thread pools. We need to make sure OT's state persists for the lifetime of any threads in those thread pools. This test checks this by spawning a thread task that will outlive the unit test's lifetime and so teardown of static state should begin before this thread finishes.

// test's lifetime and so teardown of static state should begin before this
// thread finishes.
TEST(Tracing, OtLifetime) {
  ASSERT_OK(::arrow::internal::GetCpuThreadPool()->Spawn([] {
    // This thread will outlive the main test thread.
    Span span;
    START_SPAN(span, "Test");
    SleepFor(0.1);
  }));
}

// This test checks that the Span valid invariant is maintained:
// 1. Span is invalid before START_SPAN